Looks like gsync could do this.
http://open.gandi.net/
Cheers, /N
The issue with various syncs are that you need to be there to both
perform the switch over following a failure and you also need to
manually take care that split brain is avoided. This is less of an issue
with a hard fail but a soft fail can be more problematic.
Using DRBD is a standard config with (the rightly corrected) pacemaker.
This setup will take care of soft fails and auto failover for you if you
configure it to use a quorum device. All details are available in the
initial link
Good luck
Pete
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